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 Post subject: GMAT RatePosted: Sun Nov 14, 2010 4:02 pm

Joined: Sun May 30, 2010 3:15 am
Posts: 424
A certain car can travel 40 minutes on a gallon of gasoline at 60 miles per hour. If the car had started with a full tank and had 8 gallons of gasoline left in its tank at the end, then what percent of the tank was used to travel 80 miles at 60 mph?

A. 15%
B. 20%
C. 25%
D. 30%
E. 40%

(B) 60 miles per hour is a mile a minute. 80 miles at 60 miles per hour will take 80 minutes. Since 40 minutes is 1 gallon, 80 minutes will be 2 gallons. The full tank holds 2 + 8 = 10 gallons. 2 gal/10 gal = 2/10, which is 20%. The correct answer is choice (B).
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In this question, how do you know that the full tank is 10 gallons?

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 Post subject: Re: GMAT RatePosted: Sun Nov 14, 2010 4:08 pm

Joined: Sun May 30, 2010 2:23 am
Posts: 498
There were 8 gallons of gasoline left in its tank at the end and it took 2 gallons to travel 80 miles. The car had started with the full tank.

Therefore the full tank was 8 + 2 = 10 gallons.

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